Table 4.

Characteristics of patients with ventricular preexcitation exclusively due to FVF conduction versus patients with at least one true AP with anterograde conduction.

	FVF (n = 8)	True anterograde AP (n= 14)	p-value
Age at preexcitation diagnosis (years)	15.0 (1.7–17.2)	11.6 (0.5–16.7)	0.172
Age at HCM diagnosis (years)	14.1 (0.3–19.3)	12.5 (0.3–16.7)	0.633
Male sex	4 (50)	8 (57)	1.000
PR interval (ms)	103 (80–125)	95 (65–145)	0.560
QRS duration (ms)	115 (96–125)	113 (95–192)	0.946
DWA 40 ms after delta onset (mm)	4.1 (3.3–15.3)	4.9 (1.1–22.5)	0.838
Average QRS amplitude (mm)	29.9 (14.4–47.0)	31.4 (10.6–79.9)	0.811
V6 R-wave amplitude (mm)	30.6 (12.8–39.3)	28.1 (11.4–65.0)	0.918
Normalized V6 R-wave amplitude	1.2 (0.5–1.6)	1.1 (0.4–2.5)	0.891
V1 S-wave amplitude (mm)	22.6 (5.9–41.8)	27.0 (0.0–75.3)	0.891
Normalized V1 S-wave amplitude	1.1 (0.2–2.0)	1.1 (0.0–3.1)	0.946
Storage disease	3 (38)	5 (26)	1.000
Metabolic disease	1 (13)	2 (14)	1.000
Syndromic	0 (0)	2 (14)	0.491
Isolated HCM	4 (50)	5 (38)	ref
Supraventricular tachycardia	0 (0)	5 (36)	0.115
Atrial fibrillation	3 (38)	3 (21)	0.624

data expressed as n (%) or median (range)

HCM = hypertrophic cardiomyopathy, DWA = delta wave amplitude, FVF = fasciculoventricular fiber, AP = accessory pathway